On the existence of symmetric chain decompositions in a quotient of the Boolean lattice.

Zongliang Jiang Carla D. Savage On the existence of symmetric chain decompositions in a quotient of the Boolean lattice. 5278-5283 2009 309 Discrete Mathematics 17 http://dx.doi.org/10.1016/j.disc.2007.11.036 db/journals/dm/dm309.html#JiangS09